<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>将整数保留两位⼩数</title>
</head>
<body>
    
</body>
</html>
<script>
   var arr = prompt('请输入整数');
   var obj = Number(arr).toFixed(2);    //四舍五入保留两位小数
   console.log(obj);
</script>